Remove some car parts in an attempt to improve MPG?

Injury

Lifer
Jul 19, 2004
13,066
2
81
Some of you may have seen some threads I've posted in OT about my quest to become a cheapass. (Long story short, ultimate goal is to reduce monthly expenses to buy a house in Fall 08/ Spring 09.)

I've managed to adjust my driving habits a bit that I can now go slightly over two weeks without filling up my 97 Nissan Sentra. This is a shade over 360 miles per tank, roughly 28-32MPG.

I have to get gas before I head off to work Monday morning and I don't have much to do tomorrow, so I was wondering what you guys think of maybe removing some unneeded parts from my car in an attempt to raise my MPG a bit. IE: Back seat, glove box assembly, maybe the front passenger seat... a few small "here and there's"... I might go as far as to ditch my spare tires and jumper cables because I have AAA Gold service.

It's probably not going to be a permanent thing... just for a tank of gas or two or until prices start to go down a teeny bit.

I kinda wanna see if I can hit about 37MPG for a savings about $7/fill up (I think?).

I just got an oil change, checked my tire pressure & changed my air filter today. Hopefully I'll see a slight improvement just because of that.

Edit: Let me clarify that the biggest reason I'm doing this is just for a fun experiment. I had nothing better to do today and taking some parts out and cleaning my car out took me about an hour. I think if I wanted to get picky I could take some of the trim off... remove the rear speakers in a matter of minutes... etc... but that's taking it way to far and I think the extra 10lbs there would do NOTHING.

Poll included.

UPDATE:

I'm hovering around half a tank right now. The day after I took my seat out I had to make a trip with a few other passengers for about 60 miles, and I took another trip in a hill-laden part of town for an extra 40 miles out of the norm. I'm not getting an accurate idea of how much I'm saving because of that, so I WILL go for another tank.

As it stands, factoring that in, I'm sitting around 220 miles for that half tank. Assuming the gauge is accurate, That'll be roughly 440 miles off of a 13 gallon tank (and I'd expect that the lower end of the tank will yield a slightly (and I mean that quite literally) better MPG because of the lower weight from carrying less fuel. That puts me at around 34MPG so far. I know I can do better, too. I'm doing a much better job of learning where my car can coast, timing out lights so I have to hit the brakes less, etc.

Ideally the golden rule that I've read is that anytime you're converting gasoline into friction or brake dust, you might as well just toss some change out the window.

I haven't managed to piss anyone off driving a bit slower and I only get to work a minute or two later than normal (which means I just nef before leaving a minute or two less. ;) )

Considering that gas will probably hit $4.00 in my area within a month, I think after I'm done with this little test I'll start taking the bus to work.

UPDATE 5/27

I ended up filling up again Tuesday night last week (5/20) before gas prices jumped from $3.75 to $3.99. I put about 12 gallons (roughly) in and had about 400 miles on my trip odometer. I did the math for my MPG with the exact numbers on the receipt and it came out to a shade below 34MPG. All in all, this was some good progress because with that much left, I could have gone to work at least one more day (probably.) Considering the two unexpected trips, I got one day extra than I normally do. Granted, the number of days was also influenced by my using my car less, but obviously the less often I have to fill up, the less money I spend, which is the goal.

Fast Forward to yesterday. I paid a visit to my parents about 30 miles away and found a gas station that still hadn't updated their prices since the previous spike, so I figured I'd top myself off since it was on my way. My trip odometer read 128.8 miles, and I put 3.108 gallons in my tank. Now, maybe I suck REALLY bad at math... but that's somehow 41.4 MPG???? WTF where did that come from???? I know the two trips mentioned in the previous post that might have hurt my mileage wouldn't have had that much of a difference, right? The only other possibility is that one of the two pumps I used was rigged to swindle customers already paying for craploads of gas, but in both cases the needle went to the top of gas gauge. What gives? I shit you not with these numbers... is that really possible?

My brother, who ALSO has a 97 Sentra is now doing similar things and is reporting about 35-37 MPG.
 

helpme

Diamond Member
Feb 6, 2000
3,090
0
0
If you reduce the weight of the car, you should be able to get better gas milage. The back seat and passenger seat are pretty heavy already. Spare tire, jack, floor mats, radio, interior trim... :D

Now will it allow you to get 37 MPG? I guess you'll have to try and see :D
 

dud

Diamond Member
Feb 18, 2001
7,635
73
91
Removing most of those parts is somewhat extreme. I have heard of people removing their spare tire ... but if a tire goes flat you have no backup.

Sorry that you have to drive a '97 Sentra ...
 

potato28

Diamond Member
Jun 27, 2005
8,964
0
0
Get rid of the trunk lid, all the seats except your's, dash, center console, most of the glass, some body panels and maybe the hood if you really need to. Should get you to around 37 mpg, maybe more :p
 

AnnonUSA

Senior member
Nov 18, 2007
468
0
0
Find a route that you can take that is all downhill....in both directions.
 

Uhtrinity

Platinum Member
Dec 21, 2003
2,263
202
106
At best you will probably only see single percentage points. If I have a 150 - 200 lbs passenger in my car guess how much my mileage drops? Essentially zero. If concerned about mpg find a car that get better mpg to start with. Also research and implement hypermiling techniques.
 

PingSpike

Lifer
Feb 25, 2004
21,755
599
126
Originally posted by: potato28
Get rid of the trunk lid, all the seats except your's, dash, center console, most of the glass, some body panels and maybe the hood if you really need to. Should get you to around 37 mpg, maybe more :p

Wouldn't removing most body panels negatively effect the aerodynamics of the car?
 

aleckz

Golden Member
Jan 3, 2004
1,032
0
76
I would say it would depend on how heavy everything is inside your car and how painstaking of a process it would be. If the seats are like 50lbs each, remove them. I'd keep the spare and the jack and what not, but if you plan on never ever having passengers in your car the eject the seats.
 

jagec

Lifer
Apr 30, 2004
24,442
6
81
Originally posted by: PingSpike
Originally posted by: potato28
Get rid of the trunk lid, all the seats except your's, dash, center console, most of the glass, some body panels and maybe the hood if you really need to. Should get you to around 37 mpg, maybe more :p

Wouldn't removing most body panels negatively effect the aerodynamics of the car?

That only really matters at speed. There was this humorous article about how to chop several seconds off the 1/4 mile time of a Honda Civic. They took some ricer's car, got rid of the cheapo CAI, chopped off the wing and body kit, changed back to the stock (lighter) wheels, and although they had already gotten it quite a bit faster, they went all-out with a Sawzall and removed most of the rear of the car, the roof, all the glass, every non-essential seat and moulding, the hood, and pretty much every other non-structural body panel. It posted pretty awesome 1/4 mile times at that point.

Pretty much unless ALL you do is cruise at high speed, the weight savings from removing body panels will be greater than the aerodynamic penalty.
 

mwmorph

Diamond Member
Dec 27, 2004
8,877
1
81
Originally posted by: jagec
Originally posted by: PingSpike
Originally posted by: potato28
Get rid of the trunk lid, all the seats except your's, dash, center console, most of the glass, some body panels and maybe the hood if you really need to. Should get you to around 37 mpg, maybe more :p

Wouldn't removing most body panels negatively effect the aerodynamics of the car?

That only really matters at speed. There was this humorous article about how to chop several seconds off the 1/4 mile time of a Honda Civic. They took some ricer's car, got rid of the cheapo CAI, chopped off the wing and body kit, changed back to the stock (lighter) wheels, and although they had already gotten it quite a bit faster, they went all-out with a Sawzall and removed most of the rear of the car, the roof, all the glass, every non-essential seat and moulding, the hood, and pretty much every other non-structural body panel. It posted pretty awesome 1/4 mile times at that point.

Pretty much unless ALL you do is cruise at high speed, the weight savings from removing body panels will be greater than the aerodynamic penalty.

Text

As for fuel mileage, a conservative estimate is that for every 100lbs lost, you gain 2% mpg.
 

alkemyst

No Lifer
Feb 13, 2001
83,769
19
81
Originally posted by: Mermaidman
Amputate your left leg (if you drive an automatic).

May as well the third leg too...with a thread like this it's obvious he ain't using it either.
 

GoatMonkey

Golden Member
Feb 25, 2005
1,253
0
0
Also ditch the interior carpet, trunk carpet, speakers, stereo, roof liner and insulation, interior light. If there's sound deadening material under the hood you can ditch that. Any storage bin or armrest between the seats could be removed. Any plastic bits covering things like the roof pillars can go. If you have fog lights, you probably don't really need those.

And go on a diet.
 

DarkThinker

Platinum Member
Mar 17, 2007
2,822
0
0
You could sell your car and get a Honda Insight like my friend has and get 50-61 MPG
 

potato28

Diamond Member
Jun 27, 2005
8,964
0
0
Originally posted by: GoatMonkey
Also ditch the interior carpet, trunk carpet, speakers, stereo, roof liner and insulation, interior light. If there's sound deadening material under the hood you can ditch that. Any storage bin or armrest between the seats could be removed. Any plastic bits covering things like the roof pillars can go. If you have fog lights, you probably don't really need those.

And go on a diet.

And if you live in a particularly warm part of the US all year think about making it a very large hole in the roof for... tanning :cool:
 

BlackTigers

Diamond Member
Jan 15, 2006
4,491
2
71
You definitely do not need any foam in the seat, so remove that if necessary.

Hell, the seat's heavy, so replace it with a lawn chair and anchor it down with some plastic bolts (to save weight over steel!)
 

Injury

Lifer
Jul 19, 2004
13,066
2
81
So I removed some parts today. Will probably do some more tomorrow. This isn't really about trying to make a monumental impact.

I've read up on hypermiling and there are some parts I'm willing to do and some not. So I'll try some of that out in the process, too. As it stands, I don't plan on doing this for any more than a tank or two of gas (so about a month) unless the benefits far surpass what I'm trying to do.

As for getting a car that gets better MPG... that kinda defeats the purpose in this scenario. The trade-in on a 97 Sentra is going to be about $1000 if I'm lucky, I could probably find a private buyer that would buy for $3000 if I'm lucky. If I'm really just looking for a minor savings a few bucks, dropping a few grand on a new car isn't the answer. If I was driving a 15MPG SUV... then I wouldn't hesitate to ditch it.

Let me clarify, this is entirely experimental and mostly for fun.
 

Uhtrinity

Platinum Member
Dec 21, 2003
2,263
202
106
Originally posted by: DarkThinker
You could sell your car and get a Honda Insight like my friend has and get 50-61 MPG


And that isn't even trying unless your friend drives the CVT version :)

This thread is about lightening up and trying for better mileage, just slowing down and using some basic hypermiling techniques can net from 80 to 100+ mpg. I do it all the time. My last tank was 73 mpg, mixed city and highway. That was also 2 weeks ago and I'm only 1/2 into the next tank :)
 

PlasmaBomb

Lifer
Nov 19, 2004
11,636
2
81
Originally posted by: mwmorph
Originally posted by: jagec
Originally posted by: PingSpike
Originally posted by: potato28
Get rid of the trunk lid, all the seats except your's, dash, center console, most of the glass, some body panels and maybe the hood if you really need to. Should get you to around 37 mpg, maybe more :p

Wouldn't removing most body panels negatively effect the aerodynamics of the car?

That only really matters at speed. There was this humorous article about how to chop several seconds off the 1/4 mile time of a Honda Civic. They took some ricer's car, got rid of the cheapo CAI, chopped off the wing and body kit, changed back to the stock (lighter) wheels, and although they had already gotten it quite a bit faster, they went all-out with a Sawzall and removed most of the rear of the car, the roof, all the glass, every non-essential seat and moulding, the hood, and pretty much every other non-structural body panel. It posted pretty awesome 1/4 mile times at that point.

Pretty much unless ALL you do is cruise at high speed, the weight savings from removing body panels will be greater than the aerodynamic penalty.

Text

As for fuel mileage, a conservative estimate is that for every 100lbs lost, you gain 2% mpg.

It would have been interesting to have removed the body kit and spoiler earlier. They were probably acting as a big air brake wrt drag racing.
 

XZeroII

Lifer
Jun 30, 2001
12,572
0
0
Drop as much weight as possible...from the car and you. You just got your oil changed? Drain all fluids from your car. These only add unnecessary weight. Get rid of the seats and sit on milk crates (find free ones at your local grocer). Get rid of your tires and drive around on your rims. Get rid of anything under your hood that doesn't get hot when your car has been running for awhile. If it isn't getting hot, it isn't doing anything useful. Remove your entire exhaust system...it just unnecessarily restricts exhaust flow. Remove all windows. Cut the roof off your car and replace it with cardboard; you may need to wrap the cardboard in plastic wrap so it doesn't melt away in the rain. Replace your headlights with those little LED flashlights...the power it takes to use headlights decreases your gas milage. Make your trunk air-tight, then remove all the air from it.
 

Black88GTA

Diamond Member
Sep 9, 2003
3,430
0
0
Replace all 4 wheels with donut spares? Far less weight than 4 full-size wheels...and smaller contact patch = less rolling resistance = better mpg?

Of course, the car would handle like garbage and the traction would be awful. And I don't really buy the "50mph limit" they put on donut spares (I believe it's there for other reasons), but I wouldn't like to find out that it's valid the hard way. :p Would be an interesting experiment for 1 tank though, IMO, especially if you only do city / in-town driving.

Someone with money to burn could maybe mount 4 motorcycle tires on donut spare rims and try it...:laugh:
 

hans030390

Diamond Member
Feb 3, 2005
7,326
2
76
Originally posted by: DarkThinker
You could sell your car and get a Honda Insight like my friend has and get 50-61 MPG

And then spend thousands of dollars when the battery stuff needs to be replaced in a few years.
 

nakedfrog

No Lifer
Apr 3, 2001
61,341
16,872
136
I've driven the roads that I take to work so often that I know how to time the lights... people get so irked when I'm going 20 in a 45 and pass me, but then I roll up just as the light turns green :p